It is not only a question of which version (12.3(6c)). It is more a question of which feature set. If you run the IP only, or IP Plus, or feature sets like that they do not have 3DES support. You need a feature set within 12.3(6c) like Advanced Security, or Enterprise Plus IPSEC 3DES to get support for 3DES.
You will need an IPSEC feature set supported IOS (costs $$ unless you have smartnet on the router).
You can offload 3DES encryption (optionally) to a AIM card (dedicated h/w for encryption).
You are right about the IPSec feature and the AIM. For the Cisco 2610XM, the AIM-VPN/BPII has 3DES feature and this router has one slot to install it.
I applogize for the useless answers that you have received from the group thus far. To run 3DES on your router you will need the following:
S26ASK9-12314T USD 1,000.00
Cisco 2600 IOS ADVANCED SECURITY
Yes the cost is $1,000.00 for the IOS that contains 3DES. There are other feature sets that also contain 3DES, but this was the most cost effective feature set that I found.
I personally like to install T trains, because T trains becomes mainline in the next major release. This allows you to have some added features. I would do a complete bug sweep before installing any IOS.
I hope this helps,
You are right about the S26ASK9 IOS version. I have found a document at Cisco web site (http://www.cisco.com/en/US/products/hw/routers/ps259/prod_bulletin0900aecd802a945e.html) and I am considering your suggestion. Thisisshanky´s suggestion is another way to implement 3DES feature (using AIM-VPN/BPII module).
Thank your for your help.
Even if you use the AIM-VPN, you still need the IOS with IPSEC/3DES support (ADVANCED SECURITY IOS)to make it to work. AIM is not required for VPN to work. Just that it improves performance.
I have supposed that the IPSec 3DES feature was available in AIM module without the necessity of IOS upgrade.
Thank you one more time.